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Backed by Science
We don’t just hope our formulas work — we prove they do. Validated through rigorous clinical, consumer and placebo-controlled studies, every product is tested to ensure real, visible results for your hair and scalp.
90%
56%
3 months
90%
83%
Preventative Care
A clinically proven hair longevity serum powered by plant exosomes and biotech innovation to support scalp and follicle health before thinning begins.
How It Works
How It Works
Plant Exosomes
Imagine plant exosomes as nature's own courier service, delivering high-impact messages right where they're needed most.

These nano-sized messengers boost cellular communication, instructing your scalp and hair follicles to wake up, act younger and grow stronger — without harsh chemicals or hormones.
Science-Backed
Trusted by Experts
Vegan
Clean
Cruelty-Free
Science-Backed
Trusted by Experts
Vegan
Clean
Your Transformation Timeline
MONTH 1 
Less breakage and renewed scalp youth mark early improvements.†
MONTH 2
Hair appears fuller and thicker as scalp and follicle health improve.†
MONTH 3+
Shedding decreases, density is preserved and hair vitality strengthens.†
MONTH 4+
Sustained vitality supports ongoing hair wellness® and a healthy growth cycle.†
Growing Stronger, Together
Frequently
Asked
Questions
Which hair type is this serum best for?

GRO Hair Serum works for all hair types and textures, including fine or thinning. It’s ideal for those committed to early-stage hair wellness® who want to preserve scalp and strand vitality before thinning begins to show.

How soon can I expect to see results?

With consistent daily use, most people see results from GRO Hair Serum within 3–4 months.

Will this serum make my hair greasy?

No. GRO Hair Serum is water-based and fast-absorbing, so it won’t leave your hair feeling greasy or weighed down.

What happens if I stop using it?

Hair wellness® is an ongoing journey. If you stop using GRO Hair Serum, you may notice your hair gradually return to its natural state within a few months.

Learn More
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Best Seller
4.4
Rated 4.4 out of 5 stars
5,570 Reviews
GRO Hair Serum
$49 $64
A clinically proven serum that supports scalp and follicle health before thinning begins.
GRO Biotin Gummies
4.6
Rated 4.6 out of 5 stars
591 Reviews
GRO Biotin Gummies
$30 $36
A daily multivitamin formulated with biotin to boost hair wellness®.
GRO More Kit
CROWD FAVORITE
4.5
Rated 4.5 out of 5 stars
4,293 Reviews
GRO More Kit
$69 $100
Includes: 1 GRO Hair Serum and 1 GRO Biotin Gummies Take care of your hair from the inside and out w
GRO Better Duo
4.5
Rated 4.5 out of 5 stars
5,529 Reviews
GRO Better Duo
$65 $82
Take healthier looking hair to the next level with the GRO Better Kit. Formulated for thinning, lack
GRO Revitalizing Shampoo and Conditioner Kit
With Karmatin™
4.6
Rated 4.6 out of 5 stars
1,102 Reviews
GRO Revitalizing Shampoo and Conditioner Kit
$22 $28
Kit includes: GRO Revitalizing Shampoo and GRO Revitalizing Conditioner Enhanced with clinically pro
GRO Dry Shampoo
4.7
Rated 4.7 out of 5 stars
1,034 Reviews
GRO Dry Shampoo
$18 $18
Staying true to our 360º approach to hair wellness, we’ve created the only plant-based dry shampoo w
GRO Lash and Brow Kit
Fast Results
4.3
Rated 4.3 out of 5 stars
1,017 Reviews
GRO Lash and Brow Kit
$108 $136
Combo Plan: 1 GRO Lash Serum & 1 GRO Brow Serum Try both of our beloved volumizing serums and t
GRO AGELESS Daily Duo
DREAM ROUTINE
4.4
Rated 4.4 out of 5 stars
5,382 Reviews
GRO AGELESS Daily Duo
$113 $142